Treadmill housing



FIG. 1 is a front elevational view of a treadmill housing, showing my new design;

FIG. 2 is a top plan view thereof;

FIG. 3 is a bottom plan view thereof;

FIG. 4 is a rear elevational view thereof;

FIG. 5 is a top, rear and right side perspective view thereof; and,

FIG. 6 is a top, rear and left side perspective view thereof. 

The ornamental design for a treadmill housing, as shown and described. 